Seat assembly having an adjustable head restraint assembly

ABSTRACT

A seat assembly that includes a seat back, a support post disposed on the seat back, and a headrest moveably disposed on the support post. The headrest includes first and second transverse members disposed on the support post and a spindle assembly rotatably associated with the first and second transverse members. The spindle assembly rotates to permit movement of the headrest.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims foreign priority benefits under 35 U.S.C.§119(a)-(d) to DE 10 2009 045 833.6, filed Oct. 20, 2009, which ishereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a seat assembly having an adjustablehead restraint assembly.

SUMMARY OF THE INVENTION

In at least one embodiment, a seat assembly is provided. The seatassembly includes a seat back, a support post disposed on the seat back,and a headrest moveably disposed on the support post. The headrestincludes first and second transverse members, a spindle assembly, and alocking mechanism. The first and second transverse members are disposedon the support post. The spindle assembly is rotatably associated withthe first and second transverse members. The locking mechanism isdisposed on the first transverse member. The locking mechanism engagesthe spindle assembly to inhibit movement of the headrest and disengagesthe spindle assembly to permit movement of the headrest.

In at least one embodiment, a seat assembly is provided. The seatassembly includes a seat back, a first support post fixedly disposed onthe seat back, and a headrest moveably disposed on the first supportpost. The headrest includes first and second transverse members, aspindle assembly, and a locking mechanism. The first transverse memberis moveably disposed on the first support post. The second transversemember is fixedly disposed on the first support post and has a threadedbushing. The spindle assembly is rotatably received by the first andsecond transverse members and has a threaded portion that engages thethreaded bushing. The locking mechanism is disposed on the firsttransverse member. The locking mechanism disengages the spindle assemblyto permit the spindle assembly to rotate about an axis of rotation tomove the headrest along the first support post.

In at least one other embodiment, a seat assembly is provided. The seatassembly has a seat back, a support post disposed on the seat back, anda headrest moveably disposed on the support post. The headrest includesfirst and second transverse members, a spindle assembly, and anelectrical machine. The first and second transverse members are disposedon the support post. The second transverse member has a threadedbushing. The spindle assembly is rotatably disposed on the firsttransverse member. The spindle assembly includes a threaded portion thatengages the threaded bushing. The electrical machine is configured toengage the threaded portion. The electrical machine rotates the spindleassembly about a first axis of rotation in a first direction to actuatethe first transverse member toward the second transverse member.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a seat assembly.

FIG. 2 is a perspective view of an embodiment of a head restraintassembly.

FIG. 3 is a fragmentary side view of the head restraint assembly in afirst position.

FIG. 4 is a fragmentary top view of the head restraint assembly shown inFIG. 3 along section line 4-4.

FIG. 5 is a fragmentary side view of the head restraint assembly in asecond position.

FIG. 6 is a fragmentary top view of the head restraint assembly shown inFIG. 5 along section line 6-6.

FIG. 7 is a fragmentary side view of another embodiment of a headrestraint assembly.

DETAILED DESCRIPTION

Detailed embodiments of the present invention are disclosed herein;however, it is to be understood that the disclosed embodiments aremerely exemplary of the invention that may be embodied in various andalternative forms. The figures are not necessarily to scale, somefeatures may be exaggerated or minimized to show details of particularcomponents. Therefore, specific structural and functional detailsdisclosed herein are not to be interpreted as limiting, but merely as arepresentative basis for the claims and/or as a representative basis forteaching one skilled in the art to variously employ the presentinvention.

Referring to FIG. 1, an exemplary seat assembly 10 is shown. The seatassembly 10 may be configured for use in a vehicle, such as a motorvehicle like a car or truck.

The seat assembly 10 may include a seat bottom 12 and a seat back 14. Ina vehicular application, the seat bottom 12 may be configured to bemounted on a support surface, such as a floor pan of a vehicle. The seatbottom 12 may be configured to support a seat occupant. The seat back 14may be pivotally disposed on the seat bottom 12 and may include a headrestraint assembly 16. The seat back 14 may be configured to support theback of a seat occupant.

Referring to FIGS. 2 and 3, the head restraint assembly 16 may include aheadrest 20 and one or more support posts 22. The headrest 20 may bemoveably disposed on the support posts 22 as will be described in moredetail below. The support posts 22 may be disposed on the seat back 14may be made of any suitable material or materials, such as a metal ormetal alloy. The support posts 22 may include a lower portion 24 and anupper portion 26.

The lower portion 24 may be configured as one or more tubes and may begenerally linear in one or more embodiments. The lower and upperportions 24, 26 may or may not be coaxially disposed. The lower portion24 may extend through the top of the seat back 14. In addition, thelower portion 24 may be fixedly mounted to a structural frame of theseat back 14 such that the support posts 22 do not move with respect tothe seat back 14. Alternatively, the lower portion 24 may move withrespect to the seat back 14 in one or more embodiments. For instance,the lower portion 24 may be disposed in a guide sleeve that may bedisposed on the frame of the seat back 14 or may be part of an activehead restraint system that is configured to move in response to a loadforce or vehicle impact event.

Referring to FIG. 3, the headrest 20 may be configured to support thehead of an occupant of the seat assembly 10. The headrest 20 may begenerally be disposed above the seat back 14 and may include a trimcover 30, a cushion 32, a first transverse member 34, a secondtransverse member 36, a spindle assembly 38, and a locking mechanism 40.

The trim cover 30 may cover at least a portion of a visible exteriorsurface of the headrest 20. The trim cover 30 may be made of anysuitable material or materials, such as a fabric, vinyl, leather, or thelike. The trim cover 30 may cover the cushion 32, which may be disposedunder at least a portion of the trim cover 30.

The first transverse member 34 may be moveably disposed on the supportpost 22. For example, the first transverse member 34 may include anopening through which the upper portion 26 of the support post 22extends. In the embodiment shown, a pair of openings is provided nearopposite ends of the first transverse member 34 that each receives asupport post 22.

Referring to FIGS. 3 and 4, the first transverse member 34 may include afirst aperture 50, a second aperture 52, and a slot 54. The firstaperture 50 may be disposed in a top surface of the first transversemember 34 and may receive a portion of the spindle assembly 38 as willbe discussed in more detail below. The second aperture 52 may extendfrom an end of the first transverse member 34 generally toward the slot54. The second aperture 52 may be disposed in any suitable location. Forinstance, the second aperture 52 may be a groove disposed in an exteriorsurface of the first transverse member 34 or may be a hole disposed inthe first transverse member 34. The slot 54 may generally connect thefirst and second apertures 50, 52. In FIG. 4, the slot 54 extendsthrough the first transverse member 34. The second aperture 52 and theslot 54 may be associated with or receive at least a portion of thelocking mechanism 40 as will be discussed in more detail below.

The second transverse member 36 may be fixedly disposed on the supportpost 22. For example, the second transverse member 36 may include anopening into which the upper portion 26 of the support post 22 extends.In the embodiment shown, a pair of openings is provided near oppositeends of the second transverse member 36 that each receives a supportpost 22. The second transverse member 36 may be secured to the supportpost in any suitable manner, such as with a fastener or interferencefit. Moreover, the second transverse member 36 may be integrally formedwith or be part of the support post 22 in one or more embodiments. Thesecond transverse member 36 may be substantially parallel to the firsttransverse member 34.

The second transverse member 36 may be configured to receive the spindleassembly 38. For instance, the second transverse member 36 may includean opening that receives a bushing 56. The bushing 56 may include athreaded through hole 58 that may rotatably receive the spindle assembly38 as will be discussed in more detail below. The bushing 56 may befixedly disposed on the second transverse member 36 and may be disposednear the center of the second transverse member 36.

The spindle assembly 38 may extend between the first and secondtransverse members 34, 36. The spindle assembly 38 may be configured torotate about an axis of rotation 60 and may include an engagementfeature 62, one or more collars 64, and a threaded portion 66.

The engagement feature 62 may be fixedly disposed on the spindleassembly 38. In the embodiment shown, the engagement feature 62 isconfigured as a gear having a plurality of teeth and may be secured withone or more collars 64. The engagement feature 62 may be disposed in thefirst aperture 50 of the first transverse member 34.

The threaded portion 66 may be disposed proximate the engagement feature62. In the embodiment shown, the threaded portion 66 generally extendsfrom the engagement feature 62 toward the second transverse member 36.The threaded portion 66 may include one or more threads that mate withthe threaded through hole 58 of the bushing 56. In at least oneembodiment, the threads may be configured such that the distance oftravel of the first transverse member 34 per spindle assembly revolutionis a function of the thread pitch. The engagement feature 62 and threadpitch of the threaded portion 66 may be configured to provide a desireddistance of travel per revolution and to provide a desired number orconfiguration of locking positions. For example, the quantity andpartitioning of teeth on the engagement feature 62 may be selected toprovide a desired number or configuration of discrete locking positions.

The locking mechanism 40 may be configured to selectively inhibit orpermit rotation of the spindle assembly 38. More specifically, thelocking mechanism 40 may engage the spindle assembly 38 to inhibitrotation of the spindle assembly 38 and may disengage the spindleassembly 38 to permit rotation of the spindle assembly 38.

In at least one embodiment, the locking mechanism 38 may include alocking pin 70, a linkage 72, and an input device 74. The input device74 may include a bezel 76 and a spring 78.

The locking pin 70 may be moveably associated with the first transversemember 34. For instance, the locking pin 70 may be moveably disposed inthe slot 54 in the first transverse member 34. The locking pin 70 maymove between an engagement position and a disengagement position. In theengagement position, the locking pin 70 may engage a portion of thespindle assembly 38, such as the engagement feature 62. For example, thelocking pin 70 may be disposed in a gap between adjacent gear teeth toinhibit rotation of the spindle assembly 38. In the disengagementposition, the locking pin 70 may not engage a portion of the spindleassembly 38. For example, the locking pin 70 may be spaced apart fromthe engagement feature 62, thereby permitting the spindle assembly 38 torotate when a sufficient actuation force is provided. The locking pin 70may be disposed proximate one end of the slot 54 in the engagementposition and may be disposed proximate an opposite end of the slot 54 inthe disengagement position.

The linkage 72 may extend between the locking pin 70 and the inputdevice 74. In at least one embodiment, the linkage 72 may be configuredas a wire that may include a first end that engages the locking pin 70and a second end disposed opposite the first end that may engage or beoperatively connected to the input device 74. The linkage 72 may be atleast partially disposed in the second aperture 52 of the firsttransverse member 34. In addition, the linkage 72 may be integrallyformed with the locking pin 70 in one or more embodiments.

The input device 74 may be configured to actuate the locking pin 70 andlinkage 72. The input device 74 may have any suitable configuration. Forexample, the input device 74 may be configured as a button that extendsat least partially through a hole in a headrest 20. A bezel 76 may beprovided that extends at least partially around the button to facilitatemounting and help provide a desired aesthetic appearance. The inputdevice 74 may be disposed in any suitable location. In the embodimentshown, the input device 74 is disposed proximate an end of the firsttransverse member 34. The input device 74 may include a spring 78 thatexerts a biasing force. For instance, the spring 78 may be disposedbetween the first transverse member 34 and a back surface the inputdevice 74 and may bias the input device 74 away from the firsttransverse member 34, thereby actuating the locking mechanism 40 intoengagement with the spindle assembly 38.

Actuation of the headrest 20 will now be described in more detail. InFIG. 3, the headrest 20 is shown in a first position in which theheadrest is positioned toward the seat back 14. In FIG. 5, the headrest20 is shown in a second position in which the headrest 20 is positionedaway from the seat back 14. The first and second positions may representthe maximum travel range of the headrest 20. The first and secondtransverse members 34, 36 may contact when the headrest 20 is in thesecond position. In addition, the headrest 20 may travel in asubstantially linear manner in embodiments where the upper portion 26 ofthe support post 22 is substantially linear.

In FIGS. 3 and 4, the locking mechanism 40 is in the engagementposition, which may inhibit movement of the headrest 20 with respect tothe support post 22. The locking mechanism 40 moves from the engagementposition to the disengagement position shown in FIGS. 5 and 6 whensufficient force is applied to the input device 74 to overcome thebiasing force of the spring 78. As such, the linkage 72 and locking pin70 are moved such that the locking pin 70 disengages the spindleassembly 38.

An actuation force may then be applied to the headrest 20 to move thefirst transverse member 34 with respect to the second transverse member36. For instance, an actuation force may be manually exerted upon theheadrest 20 to cause the first transverse member 34 to move along thesupport post 22. The actuation force causes the threaded portion 66 ofthe spindle assembly 38 to rotate about the axis of rotation 60. Forexample, to move from the first position shown in FIG. 3 toward thesecond position shown in FIG. 5, the actuation force may be generallydirected away from the seat back 14, thereby causing the spindleassembly 38 to rotate and be threaded through the bushing 56.Application of an actuation force toward the seat back 14 may cause thespindle assembly 38 to rotate in the opposite direction and cause theheadrest 20 to move in the opposite direction. As such, the headrest 20may be positioned in the first position, second position, or variousintermediate positions between the first and second positions when thelocking mechanism 40 is in the disengaged position and a sufficientactuation force is applied.

The headrest 20 may be secured in a desired position when the lockingmechanism 40 is in the engagement position. For instance, the biasingforce of the spring 78 may actuate the locking pin 70 via the linkage 72into engagement with the spindle assembly 38 when sufficient force isnot applied to the input device 74 to overcome the biasing force of thespring 78.

Referring to FIG. 7, another embodiment of a head restraint assembly 16′is shown. In this embodiment, the headrest 20′ is similar to that shownin FIG. 3, but the spindle assembly 38′ does not include an engagementfeature 62 or one or more collars 64 and the locking mechanism 40 hasbeen deleted.

The headrest 20′ may include an electrical machine 80, such as a motor,solenoid, or the like, that is configured to actuate the headrest 20′.The electrical machine 80 may be disposed in any suitable location, suchas on the first transverse member 34′. The electrical machine 80 mayinclude an output shaft having an engagement gear 82 that engages thethreaded portion 66′ of the spindle assembly 38′. The electrical machine80 may rotate the output shaft and the engagement gear 82 about a secondaxis of rotation 84. Rotation of the engagement gear 82 in a firstdirection about the second axis of rotation 84 may actuate the firsttransverse member 34′ toward the second transverse member 36. Rotationof the engagement gear 82 in a second or opposite direction about thesecond axis of rotation 84 may actuate the first transverse member 34′away from the second transverse member 36.

A switch 86 may be provided to control operation of the electricalmachine 80. The switch 86 may have any suitable configuration. Forinstance, the switch 86 may be a toggle switch that may be electricallyconnected to the electrical machine 80 via a wire. Alternatively, theswitch 86 may be in wireless communication with the electrical machine80, such as via an RF signal and associated controller. The switch 86may be disposed on the headrest 20′ or in any suitable location on orremote from the seat assembly 10.

The electrical machine 80 may be equipped or associated with one or moreposition sensors 88, such as Hall effect sensors, that may be used todirectly or indirectly monitor the position of the headrest 20′. Dataindicative of the position of the headrest 20′ may be used to controlthe travel of the headrest 20′, such as by limiting operation of theelectrical machine 80 to a direction or distance in which headresttravel is not impeded. In addition, data indicative of the position ofthe headrest 20′ may be compared to a desired headrest position that maybe stored in memory and the electrical machine 80 may be operated tomove the headrest 20′ to the desired headrest position when the currentheadrest position differs from the desired position.

The headrest 20′ may be disposed in a stationary position whensufficient actuation force is not provided by the electrical machine 80.In addition, the headrest 20′ may also be provided in one or moreembodiments that incorporate the features of FIGS. 3 and 7. Forinstance, a locking mechanism may be provided with the embodiment shownin FIG. 7 to provide additional control to inhibit movement of theheadrest 20′.

While embodiments of the invention have been illustrated and described,it is not intended that these embodiments illustrate and describe allpossible forms of the invention. Rather, the words used in thespecification are words of description rather than limitation, and it isunderstood that various changes may be made without departing from thespirit and scope of the invention.

1. A seat assembly comprising: a seat back; a support post disposed onthe seat back; and a headrest moveably disposed on the support post, theheadrest including: first and second transverse members disposed on thesupport post; a spindle assembly rotatably associated with the first andsecond transverse members; and a locking mechanism disposed on the firsttransverse member; wherein the locking mechanism engages the spindleassembly to inhibit movement of the headrest and disengages the spindleassembly to permit movement of the headrest.
 2. The seat assembly ofclaim 1 wherein the second transverse member further comprises a bushingthat is fixedly disposed on the second transverse member and includes athreaded through hole that engages a threaded portion of the spindleassembly.
 3. The seat assembly of claim 1 wherein the headrest movesfrom a first position toward a second position when the lockingmechanism is disengaged from the spindle assembly and an actuation forceis applied to an exterior surface of the headrest.
 4. The seat assemblyof claim 1 wherein the spindle assembly includes a gear received by thefirst transverse member.
 5. The seat assembly of claim 4 wherein thelocking mechanism includes a locking pin that engages the gear toinhibit movement of the headrest and disengages the gear to permitmovement of the headrest.
 6. The seat assembly of claim 5 wherein thefirst transverse member further comprises a slot that receives thelocking pin.
 7. The seat assembly of claim 5 wherein the lockingmechanism further comprises a button and a linkage that extends from thebutton to the locking pin.
 8. The seat assembly of claim 1 wherein thespindle assembly rotates in response to a sufficient actuation forceapplied to an external surface of the headrest when the lockingmechanism is disengaged from the spindle assembly and the spindleassembly does not rotate in response to the actuation force when thelocking mechanism is engaged with the spindle assembly.
 9. The seatassembly of claim 1 wherein the first transverse member is moveablydisposed on the support post and the second transverse member is fixedlydisposed on the support post.
 10. A seat assembly comprising: a seatback; a first support post fixedly disposed on the seat back; and aheadrest moveably disposed on the first support post, the headrestincluding: a first transverse member moveably disposed on the firstsupport post; a second transverse member fixedly disposed on the firstsupport post, the second transverse member having a threaded bushing; aspindle assembly rotatably received by the first and second transversemembers, the spindle assembly including a threaded portion that engagesthe threaded bushing; and a locking mechanism disposed on the firsttransverse member; wherein the locking mechanism disengages the spindleassembly to permit the spindle assembly to rotate about an axis ofrotation to move the headrest along the first support post.
 11. The seatassembly of claim 10 wherein the threaded portion moves through thethreaded bushing as the second transverse member moves toward the firsttransverse member.
 12. The seat assembly of claim 10 further comprisinga second support post, wherein the spindle assembly is disposed betweenthe first and second support posts.
 13. The seat assembly of claim 10wherein the first and second transverse members are spaced apart whendisposed in a first position and are not spaced apart when disposed in asecond position.
 14. The seat assembly of claim 10 wherein the spindleassembly continuously rotates about the axis of rotation when theheadrest is actuated.
 15. The seat assembly of claim 10 wherein thesecond transverse member is disposed at an end of the support post andthe first transverse member is disposed between the second transversemember and the seat back.
 16. The seat assembly of claim 10 wherein thelocking mechanism further comprises a pin disposed in a slot in thefirst transverse member, a button disposed proximate the firsttransverse member, a linkage extending between the button and the pin,and a spring that exerts a biasing force on the button to bias the pintoward the spindle assembly.
 17. A seat assembly comprising: a seatback; a first support post disposed on the seat back; and a headrestmoveably disposed on the first support post, the headrest including:first and second transverse members disposed on the first support post,the second transverse member having a threaded bushing; a spindleassembly rotatably disposed on the first transverse member, the spindleassembly including a threaded portion that engages the threaded bushing;and an electrical machine configured to engage the threaded portion;wherein the electrical machine rotates the spindle assembly about afirst axis of rotation in a first direction to actuate the firsttransverse member toward the second transverse member.
 18. The seatassembly of claim 17 further comprising a second support post disposedon the seat back, wherein the first axis of rotation extendssubstantially parallel to the first and second support posts and isdisposed substantially at the center of the first and second transversemembers.
 19. The seat assembly of claim 17 wherein the electricalmachine is configured to rotate an engagement gear about a second axisof rotation, the engagement gear engaging the threaded portion.
 20. Theseat assembly of claim 17 wherein the electrical machine is an electricmotor that is disposed on the first transverse member.